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https://issues.apache.org/jira/browse/FLINK-20217?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17338353#comment-17338353
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Nico Kruber commented on FLINK-20217:
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I'd still consider this a major hurdle for which workarounds require quite some
implementation effort by users.
> More fine-grained timer processing
> ----------------------------------
>
> Key: FLINK-20217
> URL: https://issues.apache.org/jira/browse/FLINK-20217
> Project: Flink
> Issue Type: Improvement
> Components: API / DataStream
> Affects Versions: 1.10.2, 1.11.2, 1.12.0
> Reporter: Nico Kruber
> Priority: Major
>
> Timers are currently processed in one big block under the checkpoint lock
> (under {{InternalTimerServiceImpl#advanceWatermark}}. This can be problematic
> in a number of scenarios while doing checkpointing which would lead to
> checkpoints timing out (and even unaligned checkpoints would not help).
> If you have a huge number of timers to process when advancing the watermark
> and the task is also back-pressured, the situation may actually be worse
> since you would block on the checkpoint lock and also wait for
> buffers/credits from the receiver.
> I propose to make this loop more fine-grained so that it is interruptible by
> checkpoints, but maybe there is also some other way to improve here.
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